Improvement in chairs



MPETERS, PHDTO-LITHOGRAPHER. WASHINGTON. o C,

dln-ined' gratte' @stent @titille crans TUCKER, o-EfrEnnE EAuTE'rNDrANA.

Letters Patent No. 111,494-, dated January 31, 1871.

. IMPROVEMEN'I, IN CHAIRS.

The Schedule referred. to in these Letters Patent and making parl: el` the same.

a full, clear, and exact description of the same, reference being had tothe accompanying drawing making a part of this specification, in which-.

l Figure lis a perspective view of my improved chair,

showing the pivoted back, the spring which holds it in position, one of the sockets to which the back is piv- .oted, the feet upon which the chairrests, and the socket into which the screw which' elevates or depresses the seat enters.

Figure `2 is a central sectional elevation showing the method of pivoting the back to the seat, and the screw for elevating the same.

Corresponding lettersrefer to corresponding parts in both gures. l ,Y

This invention relates to that class of devices the seat of which is raised and lowered by lmeans of a screw attached to the Seat, and which works in a stationary nut or socket, the object being to provide a chair which shall be peculiarly adapted for the use of persons operating the different kinds of sewingmachines; and l' It consists in constructing a chair with a swinging or pivoted back, which isheld in position with reference tothe back of vthe occupant by springs, and whichmay have its seat raised or lowered to suit the convenience .of such occupant, ,as will be more fully explained hereinafter, l

A A. inA the drawing refer to the legsof the chair, which may he of -meta-l, if preferred, and of any desired form, such as that shown in the drawing, or any other that may suit the views of the constructor, their lower ends being placed at a suli'cient distance from each other to cause the chairto rest rmly upon ythe door.

B'refers to a socket or nut, to which the upper end of the legsare attached.

This socket occupies a vertical position underneath the seat 'o f the chair, and has an aperture in` it in which a 'screw-thread `is formed to enable it to receive a screw, B', which is firmly secured to the under side of the seat of thev chair, so that, by turning such 'seat around, it may be raised lor lowered to snit the convenience of the occupant of the chair.

As tlieparts above referred to, when separately considered, do not forin any part of `this invention, a more minute-description of them' is not regarded as necessary. v

C refers to the seat of the chair, which may consist of 'a .frame-work of wood of the proper size, it being covered with cane, leather, or other suitable material, and provided near its rear end with slots for the passage of the side pieces of the back to pass through, such slots being of suflicient length to ,permit the back to assume the different angles required by the occupant,

C C refer to sockets which are to be screwed to the lower side of the' frame-work ol the seat, and iu such a position that the apertures in them shall correspond with the slots in the frame, in order that the lower ends of the side-pieces of the'back of the chair may bc pivoted to them, as shown in Iigsl l and' 2.

D refers to the swinging back of the' chair, which consists of a frame-work of wood, which is to be covered with sonie yielding material, so as to causeA itt-o i form a suitable support to the back of the person who occupies it. v A

The vertical po1ticns""of.tl1is frame' are of suicient length to admit `of them extending downward into the socket OC', and being pivoted thereto, while'the 'upper ends entend upward so as .to receive the horizontal portions and the material with which the back is covered.

E E referto springs, those shown being bf the spiral form, but which may he Aof any other form if preferred, their oftice being to hold the back ofthe cha-ir in contact with the person of the occupant while sitting in such position as is rnade necessary in operating thc different kinds of sewing-'machines in use.

These springs are attached to the back of the chair at-one of their ends, while their opposite ends are secured to vthe seat, and are so arranged that the back of the chair will be drawn forward to a vertical or past vertical-position if necessary, but at thesame cal, because it is capable of having its seat raised and lowered to suit the heights of the person using it, but principally because of thefact that, owing to the automatic adjustability of its back, it will at all times afford a support for the occupant while operating such machines; but while it is adapted to the use above described, it will at the same timebe found to be well adapted for use as au easy or recliningchair.

Having thus described my invention,

What I claim, and desire to secure by Letters Patent, is i 1. 'lhe yielding back D of a chair pivoted to the seat thereof, and having springs connectingV the two parts'abovc named, so arranged that theback will automatically pass forward of a vertical line, and thus Aaccommodate itself' to the position of the occupant,

substantially as set forth.

2. The within-described chair consisting of an automatically-adjustable or yielding back, in combination with the vertically-adjustable seat, substantially as and for the purpose set forth.

3. The combination and arrangement of the backs CYRUS TUCKER. 

